6v
As far as I know this model has a 6V system and was originally equipped with the blinkers and brake lights and a little battery. There is not a lot of power available, the original headlight bulb is just a miserly 11 watt!
When I was investigating on mine, I think it was an '85, I could not really find a wiring diagram so I made one myself - I could try to find it if you need it.
Anyway, I do remember that a part of the electrical system runs on AC current and another part on DC current, the DC part is probably blinkers. I assume your bike has been stripped over the years from all unnecessary items, but do you still have the rudimentary wiring loom that it came with originally? It'll be expensive I guess to buy all the parts from yamaha that have been taken off, so some DIY engineering might be in order.
If you go the way of etrofitting with a XT600 system, be advised that the CDI unit between TT and XT is the same.
Auke
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